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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Allen-KH Cheng <allen-kh.cheng@mediatek.com>,
        Rex-BC Chen <rex-bc.chen@mediatek.com>,
        Mark Brown <broonie@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.15 026/124] spi: spi-mtk-nor: initialize spi controller after resume
Date:   Tue, 26 Apr 2022 10:20:27 +0200
Message-Id: <20220426081748.049178955@linuxfoundation.org>
In-Reply-To: <20220426081747.286685339@linuxfoundation.org>
References: <20220426081747.286685339@linuxfoundation.org>
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From: Allen-KH Cheng <allen-kh.cheng@mediatek.com>

[ Upstream commit 317c2045618cc1f8d38beb8c93a7bdb6ad8638c6 ]

After system resumes, the registers of nor controller are
initialized with default values. The nor controller will
not function properly.

To handle both issues above, we add mtk_nor_init() in
mtk_nor_resume after pm_runtime_force_resume().

Fixes: 3bfd9103c7af ("spi: spi-mtk-nor: Add power management support")

Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
Reviewed-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Link: https://lore.kernel.org/r/20220412115743.22641-1-allen-kh.cheng@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/spi/spi-mtk-nor.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
index 5c93730615f8..6d203477c04b 100644
--- a/drivers/spi/spi-mtk-nor.c
+++ b/drivers/spi/spi-mtk-nor.c
@@ -909,7 +909,17 @@ static int __maybe_unused mtk_nor_suspend(struct device *dev)
 
 static int __maybe_unused mtk_nor_resume(struct device *dev)
 {
-	return pm_runtime_force_resume(dev);
+	struct spi_controller *ctlr = dev_get_drvdata(dev);
+	struct mtk_nor *sp = spi_controller_get_devdata(ctlr);
+	int ret;
+
+	ret = pm_runtime_force_resume(dev);
+	if (ret)
+		return ret;
+
+	mtk_nor_init(sp);
+
+	return 0;
 }
 
 static const struct dev_pm_ops mtk_nor_pm_ops = {
-- 
2.35.1